— —, supposed connection of, with opposite currents on the coast of the United States, W. C. Redfield, xxxii, 349.
— —, extent of, xxxii, 350.
— —, ice of the north brought within the dissolving influence of, on the Newfoundland bank, W. C. Redfield, xxxii, 351.
— —, loss of vessels in, xx, 158.
— —, remarks on, M. F. Maury, xlvii, 161.
Gum, composition of, xxii, 350.
— ammoniacum, xx, 399.
Gun barrels, browning of, xxxiv, 45.
Gunpowder, A. Ure on the composition of, xx, 190.
—, experiments on, A. Mordecai, xlix, 180.